There are 7 repositories under humhub-theme topic.
FlatHub - Fully remade for HumHub 1.3.6!
[WIP] Guide to HumHub and how to use it.
Dark Mode for HumHub
A curated list of awesome resources for HumHub
Flattened Hub - For Humhub 1.5 ! http://humhub.com
Humhub Default theme in Discord Blue
This is Template Novator for humhub v.1.5.2